Is hypochondria an actual disease that can be treated?

Yes: It is a psychiatric disorder that falls in the category of somatiform disordrs. Therapy can help in treating this.

Yes & Yes: Hypochondria is now called health anxiety disorder. It occurs when a person becomes obsessed with the idea that they have serious medical problems /condition (when there is no diagnosed condition). Cognitive Behavioral Therapy is often the most effective approach to treating hypochondria. Psychoeducation and exposure therapy have been used as well as treatment with antidepressant medications.